I wouldn't exactly say I'm a collector of them, but there are certain U.S. arms that I do really like and own.
I have:
1942 Springfield M1 Garand
1955 HRA M1 Garand
Inland M1 Carbine
Standard products M1 Carbine
1914 Colt 1911 Arsenal rebuilt during WW II
Smith & Wesson Victory Model .38 Special
Here are a few of them: